Ece661 Computer Vision : Hw6 2 Finding Feature Points

In this homework, we use checker board pattern. We place the pattern on model plane(where Z component of world corrdinate is zero). And then several picture are taken by changing the location and rotation angle of the camera. We can get world coordinate of these corner easily by ordiering the corner point from top to bottom and from left to right. There are 8 vertical lines and 10 horizontal lined resulting in 80 corner points. The corner point detection procedures for the captured image are: 1) Apply the Canny edge detector to the images 2) Use the Hough transform to fit straight lines to the Canny edges 3) Group the lines into horizontal and vertical line sets. 4) Sort each set of lines (e.g. top to bottom for horizontal and left to right for vertical). 5) If two or more lines are very close then they probably correspond to the same line in the physical world.